Electric signalling systems



April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. '7, 1956 35 Sheets-Sheeil 1 LINE C/RCU/T CONT/20L EQUIPMENT April 25, 1961 E. P. G. WRIGHT ET AL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 35 Sheets-Sheet 2 Make a /NcoM/Na conf Bda/mv@ cannot c/RcU/T 500k/'f7 Z/F ZZF Attorney April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING sYsTEMs Filed Aug. 7, 1956 35 Sheets-Sheet 5 .S70/(AGE TRACK CENTRO/ CIRCUIT FIG.

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ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 55 Sheets-Sheet 5 FIG.5.

INCM/NG 500k TRANSFER CIRCUIT [0mm/5 fr0/77 l* 0//7er me (cfs. 6M

A Harney April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 55 Sheets-Sheet 6 COMMON STORAGE CONTROL CIRCUIT W2 9 fl 26/5/ A ttorn e y April 25, 1961 E. P. G. WRIGHT x-:TAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 33 Sheets-Sheet '7 7 7//? NoN-CYCLING PATTERN Mal/wml? l' Rf /s rra 4 A ttorney April 25, 1961 E. P. G. WRIGHT ET Ax. 2,981,789l

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 35 Sheets-Sheet 8 FIQBA.

CHART 0F PULSE TRAINS FOR INCOMING C005 STRGE April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS A ttorn ey April 25, 1961 E. P. G. WRIGHT ET AI. 2,981,789

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A WEIR RIC E Attorney April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. '7, 1956 35 Sheets-Sheet 11 A ttorn ey April 25, 1961 E. P. G. WRIGHT ET AL ELECTRIC SIGNALLIG SYSTEMS Filed Aug. 7, 1956 /0//2 may Attorney April 25, 1961 E, P. G. WRIGHT ET AL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Attorney April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 35 Sheets-Sheet 14 lf/ IP@ April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789v

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 55 Sheets-Sheet 15 Inventors E. P. G.WR|GHT' D.A.'WE|R RICE By J Attorney E. P. G. WRIGHT ETAI.

ELECTRIC SIGNALLING SYSTEMS April 25, 1961 33 Sheets-Sheet 16 Filed Aug. 7, 1956 April 25, 1961 E. P. a. WRIGHT ET AL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 33 Sheets-Sheet 18 MEMORY-STGRE RECR//VG CONTRL CIR CUIT ZU/F 5 ecard Z ew Inventors E. P. G. WRIGHT- D.A.wElR J RICE April 25, 1961 E. P. G. WRIGHT ETAL 2,981,789

ELECTRIC SIGNALLING SYSTEMS Filed Aug. '7, 1956 55 Sheets-Sheet 19 (c) 2 [MI5 MIsl/ul s lMlsI/MISML L lime 5ta/e oe/a/es fof im '/Iaraf/@f and rear/les za/FZ MgMgM-sMs/ns MM5/MM l E; D. J.

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ELECTRIC SIGNALLING SYSTEMS Filed Aug. 7, 1956 35 Sheets-'Sheet 20 5 4 5 2 f D 222/2 b, 22f// 25//5 WW w50 W0 25mg 22M W50 Ww 222 @iai/254i@ /2'5 waa WW 4 [j L) 1 4 i. Inventors E. P G. WRIGHT' BMJ* A itorn e y 

